diff --git a/src/fully_read.rs b/src/fully_read.rs
index ae629b10..cd2e0458 100644
--- a/src/fully_read.rs
+++ b/src/fully_read.rs
@@ -13,7 +13,10 @@ ruma_event! {
         event_type: FullyRead,
         fields: {
             /// The unique identifier for the room associated with this event.
-            pub room_id: RoomId,
+            ///
+            /// `None` if the room is known through other means (such as this even being part of an
+            /// event list scoped to a room in a `/sync` response)
+            pub room_id: Option<RoomId>,
         },
         content: {
             /// The event the user's read marker is located at in the room.
diff --git a/src/receipt.rs b/src/receipt.rs
index d6d89809..773b485b 100644
--- a/src/receipt.rs
+++ b/src/receipt.rs
@@ -14,7 +14,10 @@ ruma_event! {
         event_type: Receipt,
         fields: {
             /// The unique identifier for the room associated with this event.
-            pub room_id: RoomId,
+            ///
+            /// `None` if the room is known through other means (such as this even being part of an
+            /// event list scoped to a room in a `/sync` response)
+            pub room_id: Option<RoomId>,
         },
         content_type_alias: {
             /// The payload for `ReceiptEvent`.
diff --git a/src/typing.rs b/src/typing.rs
index 6c136408..77ca4957 100644
--- a/src/typing.rs
+++ b/src/typing.rs
@@ -10,7 +10,10 @@ ruma_event! {
         event_type: Typing,
         fields: {
             /// The unique identifier for the room associated with this event.
-            pub room_id: RoomId,
+            ///
+            /// `None` if the room is known through other means (such as this even being part of an
+            /// event list scoped to a room in a `/sync` response)
+            pub room_id: Option<RoomId>,
         },
         content: {
             /// The list of user IDs typing in this room, if any.